Chromium(VI) reduction and accumulation on the kaolinite surface in the presence of cationic soil flocculant

Szewczuk-Karpisz, Katarzyna; Fijałkowska, Gracja; Wiśniewska, Małgorzata; Wójcik, Grzegorz

doi:10.1007/s11368-020-02677-1

Cited by 26 publications

(17 citation statements)

References 34 publications

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“…The valence forces through the exchange or sharing of electrons between adsorbate and adsorbent. Such a good fitting of experimental data to PSO was also observed during the study on lead(II), chromium(VI) and copper(II) adsorption on kaolinite [ 41 , 42 , 43 ], as well as copper(II) and silver(I) ions on biochar [ 44 , 45 ]. However, it must be emphasized that some researchers do not agree with these assumptions.…”

Section: Resultssupporting

confidence: 65%

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

et al. 2021

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Pure zeolite (Na-X) and a zeolite–carbon composite (Na-X(C)) were investigated as adsorbents of heavy metals—Pb2+ and Zn2+ from an aqueous solution. These materials were synthesized from fly ash—a waste from conventional hard coal combustion. Both solids were characterized using XRD, SEM-EDS, nitrogen adsorption/desorption, particle size and elemental composition analyses. The adsorption study was performed at pH 5 in the systems containing one or two adsorbates simultaneously. The obtained results showed that the pure zeolite was characterized by a more developed surface area (728 m2/g) than its carbon composite (272 m2/g), and the mean pore diameters were equal to 1.73 and 2.56 nm, respectively. The pure Na-X zeolite showed better adsorption properties towards heavy metals than its Na-X(C) composite, and Zn2+ adsorbed amounts were significantly higher than the Pb2+ ones (the highest experimental adsorption levels were: for Zn2+—656 and 600 mg/g, and for Pb2+—575 and 314 mg/g, on the Na-X and Na-X(C) surfaces, respectively). The zinc ions are exchanged with the cations inside the zeolite materials structure more effectively than lead ions with a considerably larger size. In the mixed systems, the competition between both heavy metals for access to the active sites on the adsorbent surface leads to the noticeable reduction in their adsorbed amounts. Moreover, the hydrochloric acid was a better desorbing agent for both heavy metals, especially Pb2+ one (desorption reached 78%), than sodium base (maximal desorption 25%).

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Section: Resultssupporting

confidence: 65%

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

et al. 2021

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“…In addition to electrostatic interactions, Cu(II) adsorption on kaolinite may be connected by other mechanisms, i.e., ion exchange, surface complexation and van der Waals attractions [ 31 ]. The previous study on the adsorption of lead(II) and chromium(VI) ions on kaolinite also indicated the best fitting of adsorption isotherm data to Langmuir model [ 11 , 12 , 32 ].…”

Section: Resultsmentioning

confidence: 94%

“…Its specific surface area equals 8.02 m 2 /g, while total pore volume (V p ) is 0.0287 cm 3 /g. It contains two groups of mesopores of average diameters equal to 3.8 and 11.7 nm [ 12 ].…”

Section: Methodsmentioning

confidence: 99%

“…For example, Fijałkowska et al [ 11 ] found that lead(II) had a stronger affinity to the kaolinite surface in the presence of anionic polyacrylamide. The same team [ 12 ] observed that cationic polyacrylamide adsorbed on the kaolinite surface contributed to higher adsorption level of chromium(VI) ions. These phenomena were associated with the formation of polymer-heavy metal ion complexes.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Sinorhizobium meliloti Exopolysaccharide on Adsorption and Aggregation in the Copper(II) Ions/Supporting Electrolyte/Kaolinite System

et al. 2021

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To obtain insight into physicochemical interactions between Cu(II) ions, kaolinite, and exopolysaccharide (EPS) synthesized by Sinorhizobium meliloti Rm 1021 soil bacteria, an adsorption, electrokinetic, and aggregation study was performed in the selected systems. The obtained data showed that supporting electrolyte type affects both EPS and Cu(II) ions adsorption. For initial Cu(II) concentration 100 mg/L, 4.36 ± 0.25 mg/g (21.80 ± 1.00%) of the ions were adsorbed in 0.001 M NaCl and 3.76 ± 0.20 mg/g (18.80 ± 1.00%) in 0.001 M CaCl2. The experimental data were best fitted to the Langmuir model as well as pseudo second-order equation. The EPS adsorbed amount on kaolinite was higher in the CaCl2 electrolyte than in NaCl one. For an initial polymer concentration of 100 mg/L, the EPS adsorbed amount was 4.69 ± 0.08 mg/g (23.45 ± 0.40%) in 0.001 M NaCl and 5.26 ± 0.15 mg/g (26.32 ± 0.75%) in 0.001 M CaCl2. In the mixed system, regardless of electrolyte type, exopolysaccharide contributed to immobilization of higher amount of copper(II) ions on the clay mineral. Also, in the samples containing heavy metal ions and exopolysaccharide simultaneously, the aggregation of kaolinite particles was the strongest. The results presented in the paper may be very helpful in soil bioremediation, especially in the development of technologies reducing the mobility of heavy metals in the environment.

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“…Other ionic substances may also affect the adsorption of metal ions (Wiśniewska et al 2018;Szewczuk-Karpisz et al 2020;Fijałkowska et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Structural properties and adsorption of uranyl ions on the nanocomposite hydroxyapatite/white clay

et al. 2021

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Uranium is more and more extensively applied as a source of energy and can be potentially used for nuclear weapon production. Owing to that fact, the problem of uranium expansion in the environment is the object of research and draw attention many scientists. One of the most effective methods of uranium removal from the wastewater (where uranium is present in a low concentration and occurs mainly in the form of uranyl ion, UO22+) is the adsorbent usage. It is important to discover an adsorbent which will be effective, widely available and cheap. The paper discusses properties and the ability of U (VI) adsorption on a clay and nanocomposite clay/Hap (hydroxyapatite) obtained by wet method. The adsorbents were characterized by the mentioned below tests: XRD, XRF, the porosity (nitrogen adsorption–desorption method), zeta potential, surface charge density and sorption of U (VI). It was shown that nanocrystalline composites Hap/white clay can be appropriate adsorbent for removal of uranyl ions. The adsorption depends on the temperature and pH of the solution.

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Chromium(VI) reduction and accumulation on the kaolinite surface in the presence of cationic soil flocculant

Cited by 26 publications

References 34 publications

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

Impact of Sinorhizobium meliloti Exopolysaccharide on Adsorption and Aggregation in the Copper(II) Ions/Supporting Electrolyte/Kaolinite System

Structural properties and adsorption of uranyl ions on the nanocomposite hydroxyapatite/white clay

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